# Complete electrodynamics of a BCS superconductor with μeV energy scales: Microwave spectroscopy on titanium at mK temperatures

@article{Thiemann2018CompleteEO,
title={Complete electrodynamics of a BCS superconductor with
$\mu$eV
energy scales: Microwave spectroscopy on titanium at mK temperatures},
author={Markus Thiemann and Martin Dressel and Marc Scheffler},
journal={Physical Review B},
year={2018}
}
• Published 7 March 2018
• Physics
• Physical Review B
We performed resonant microwave measurements on superconducting titanium (Ti) down to temperatures of 40~mK, well below its critical temperature $T_\mathrm{c} \approx 0.5$~K. Our wide frequency range 3.3-40~GHz contains the zero-temperature energy gap $2\Delta_0$ and allows us to probe the full electrodynamics of the superconducting state, including excitations across the gap and the low-frequency responses of superfluid condensate and thermal quasiparticles. The observed behavior follows the…
8 Citations

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## References

SHOWING 1-10 OF 78 REFERENCES

### Single-Gap Superconductivity and Dome of Superfluid Density in Nb-Doped SrTiO_{3}.

• Physics, Materials Science
Physical review letters
• 2018
SrTiO_{3} exhibits a superconducting dome upon doping with Nb, and T_{c}, 2Δ, and the superfluid density as a function of charge carrier concentration are determined, and all three quantities exhibit the characteristic dome shape.

### Electrodynamics of the Superconducting State in Ultra-Thin Films at THz Frequencies

• Physics
IEEE Transactions on Terahertz Science and Technology
• 2013
In this paper, we report on terahertz frequency-domain spectroscopy (THz-FDS) experiments in which we measure charge carrier dynamics and excitations of thin-film superconducting systems at low

### Superfluid density and microwave conductivity of FeSe superconductor: ultra-long-lived quasiparticles and extended s-wave energy gap

• Physics
• 2016
FeSe is an iron-based superconductor of immense current interest due to the large enhancements of Tc that occur when it is pressurised or grown as a single layer on an insulating substrate. Here we

### Direct observation of the superconducting energy gap developing in the conductivity spectra of niobium

• Physics
• 1998
The electrodynamic response of Nb in the frequency range above and below the energy gap 2D is studied in the normal and in the superconducting state. A coherent source interferometer is utilized in

### Direct observation of the superconducting gap in thin film of titanium nitride using terahertz spectroscopy

• Physics
• 2012
We report on the charge carrier dynamics of superconducting titanium nitride (TiN) in the frequency range 90–510 GHz (3–17 cm−1). The experiments were performed on an 18-nm thick TiN film with a

### Survival of superconducting correlations across the two-dimensional superconductor-insulator transition : A finite-frequency study

• Physics
• 2007
The complex ac conductivity of thin highly disordered $\mathrm{In}{\mathrm{O}}_{x}$ films was studied as a function of magnetic field through the nominal two-dimensional superconductor-insulator

### Nodal quasiparticle dynamics in the heavy fermion superconductor CeCoIn₅ revealed by precision microwave spectroscopy.

• Physics
Nature communications
• 2013
Low-temperature microwave spectroscopy is used to study the charge dynamics of the CeCoIn₅ superconducting state, exposing key differences, including prominent multiband effects and a temperature-dependent renormalization of the quasiparticle mass.

### Electrodynamics of high- T c superconductors

• Physics
• 2005
Recent studies of the electromagnetic response of high-Tc superconductors using terahertz, infrared, and optical spectroscopies are reviewed. In combination these experimental techniques provide a

### Microwave conductivity and penetration depth in the heavy fermion superconductor CeCoIn5.

• Physics
Physical review letters
• 2002
The electrodynamic properties of the quasi-two-dimensional heavy fermion superconductor CeCoIn5 have been investigated by microwave surface impedance measurements over a wide range of microwave frequencies and temperatures and derive a value penetration depth approximately 190 nm, consistent with a superconducting gap with line nodes.

### Dynamical study of phase fluctuations and their critical slowing down in amorphous superconducting films

• Physics
• 2011
We report a comprehensive study of the complex AC conductance of amorphous superconducting InO$_x$ thin films. Using a novel broadband microwave `Corbino' spectrometer we measure the explicit